Single mode optical fiber

Details Single mode optical fiber Single mode optical fiber

1985-02-08

1987-02-10

Sikes, William L.

G02B 622

Patent

active

046419179

ABSTRACT:
A single mode optical fiber comprises a core, a first cladding surrounding the core, and a second cladding surrounding the first cladding. It also comprises a third cladding region (or index "ring"). The core, has radius a and refractive index n.sub.c, the first, second, and third cladding regions have inner radii, R.sub.1i, R.sub.2i, and R.sub.3i, outer radii R.sub.1o, R.sub.2o, and R.sub.3o, and indices n.sub.1, n.sub.2, n.sub.3, respectively. The fiber has n.sub.1 <n.sub.3, R.sub.1o .ltoreq.R.sub.3i, R.sub.3o .ltoreq.R.sub.2i. In preferred embodiments, a=R.sub.1i, R.sub.1o =R.sub.3i, R.sub.3o =R.sub.2i. Appropriate choice of ring parameters can result in a lowering of the cut-off wavelength of the fiber, or in fiber that is less sensitive to macrobending than similar prior art fiber lacking an index ring, without substantial change in fiber parameters that depend primarily on the waveform in the core. An optical fiber communications system comprising the inventive fiber is also disclosed.

REFERENCES:
patent: 4217027 (1980-08-01), MacChesney et al.
patent: 4372647 (1983-02-01), Okamoto et al.
patent: 4435040 (1984-03-01), Cohen et al.
patent: 4447127 (1984-05-01), Cohen et al.
The Bell System Technical Journal, vol. 62, Nov. 1983, "Calculation of Modes in an Optical Fiber Using the Finite Element Method and EISPACK" by T. A. Lenahan, pp. 2663-2694.
Electronics Letters, vol. 20, No. 10, May 10, 1984, "Low-Dispersion Single-Mode Silica Fibre with Undoped Core and Three F-Doped Claddings" by H. Etzkorn et al, pp. 423-424.
Journal of Lightwave Technology, vol. LT-2, No. 3, Jun. 1984, "Equivalent Optical Waveguides" by Richard J. Black et al., pp. 268-276.
Electronics Letters, vol. 21, No. 1, Jan. 3, 1985, "Observation of Modal Noise in Single-Mode-Fibre Transmission Systems" by N. K. Cheung, pp. 5-7.

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